It won't really change the engine noise, it'll just change/enhance the air-going-into-your-engine-noise which ends up sounding Darth Vader-ish if you are using an aluminum cold air.
if you replace it, it will just sound the same if you upgrade it you will gain about 2-3HP and use more fuel meaning less mileage I HAVE A 2003 TAHOE AND I INSTALLED THE COLD AIR INTAKE AND IT GAVE IT A BETTER SOUND
A pressure test on the cylinders will tell if you have a bad head gasket. If you hear a whistle sound near the intake gasket, spray WD-40 (or any type of petroleum spray) on the area and if there is a leak the engine rpms (or engine sound) should change.
Generally speaking, if you had a plastic/rubber intake and you switch to an aluminum cold air intake, then yes, you are going to have a different sound of your engine taking in air... it's going to sound a little more Darth Vader-ish. This will be enhanced if you also use a metallic stainless steel filter like Blitz, CP, X3, etc.
roll back the driver
Get a 2nd opinion from another mechanic or friend.
Check for a vacuum leak around the throtle body and intake manifold.
A defective vacuum line can cause a whistling sound when the vehicle is accelerating. A loose belt can also create a high pitched whistle sound.
Device Manager
Ask the IT Department.
Mine does the same thing.. and im pretty sure that it is the auxiliary fan
The variable intake controls the amount of air pushed through the engine in order to keep it from stalling. The laws of physics that describe Air flow at speeds below Mach 1 (speed of sound) are different for air flow at supersonic speeds. So the size and shape of the engine inlet at low speeds are different that at high speeds.
Sound like it had nothing to do will the intake. The only thing spinning when you shut off the engine would be the fan motor. This squealing happened on my 95 Cavalier. (fyi I have a 98 Bonneville(.